Viewing window



FIG. 1 is a top plan view of a viewing window showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view; the left side being a mirror image thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view of a second embodiment of a viewing window showing our new design;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a front elevational view thereof;

FIG. 9 is a right side elevational view, the left side being a mirror image thereof;

FIG. 10 is a rear elevational view thereof;

FIG. 11 is a right side elevational view of the viewing window in FIG. 4 with the cover raised; and

FIG. 12 is a right side elevational view of the viewing window in FIG. 9 with the cover raised. 

The ornamental design for a viewing window, as shown and described. 